Patents by Inventor Hirofumi Katoh
Hirofumi Katoh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 6896179Abstract: To predice impending system failures, dummy messages are periodically transmitted from a surveillance computer via a message broker to a host computer that executes processes in response to electronic messages from terminals and returns an electronic message. The dummy electronic messages are time-stamped when transmitted from the surveillance computer, when received and transmitted by the message broker, and when a process is executed by the host. The surveillance computer predicts impending failures by comparing the time required while a transmitted dummy electronic message returns to the surveillance computer, a mean value of the required time, a time required while the dummy electronic message passes through the message broker, a mean value of the time for the passage, a time required for a dummy electronic message transmission between each computer and a mean value of the time for transmission to each base value.Type: GrantFiled: July 8, 2003Date of Patent: May 24, 2005Assignee: International Business Machines CorporationInventors: Makoto Satoh, Takashi Furuta, Kuniaki Nakajima, Hirofumi Katoh
-
Publication number: 20040134739Abstract: A viscous fluid coupling includes a housing rotatably supported to a drive shaft of an engine. An operation plate set in the housing divides a space of the housing into a reservoir and an operation chamber. The operation plate has a communication hole communicating the reservoir and the operation chamber. A rotor fixed to the drive shaft is disposed in the operation chamber. A valve mechanism installed to the operation plate to close and open the communication hole according to ambient temperature of the housing. A driven wheel fixed to the housing is located between the operation plate and the rotor. A torque transmitting section includes a first annular projection concentrically formed on the driven wheel and a plurality of second annular projections concentrically formed on the rotor. The first annular projections are overlappedly adjacent to the second annular projections so as to establish fluid coupling therebetween through the viscous fluid.Type: ApplicationFiled: December 23, 2003Publication date: July 15, 2004Applicant: UNISIA JECS CORPORATIONInventors: Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
-
Publication number: 20040042472Abstract: To predice impending system failures, dummy messages are periodically transmitted from a surveillance computer via a message broker to a host computer that executes processes in response to electronic messages from terminals and returns an electronic message. The dummy electronic messages are time-stamped when transmitted from the surveillance computer, when received and transmitted by the message broker, and when a process is executed by the host. The surveillance computer predicts impending failures by comparing the time required while a transmitted dummy electronic message returns to the surveillance computer, a mean value of the required time, a time required while the dummy electronic message passes through the message broker, a mean value of the time for the passage, a time required for a dummy electronic message transmission between each computer and a mean value of the time for transmission to each base value.Type: ApplicationFiled: July 8, 2003Publication date: March 4, 2004Applicant: International Business Machines CorporationInventors: Makoto Satoh, Takashi Furuta, Kuniaki Nakajima, Hirofumi Katoh
-
Patent number: 6679365Abstract: A viscous fluid coupling includes a housing rotatably supported to a drive shaft of an engine. An operation plate set in the housing divides a space of the housing into a reservoir and an operation chamber. The operation plate has a communication hole communicating the reservoir and the operation chamber. A rotor fixed to the drive shaft is disposed in the operation chamber. A valve mechanism installed to the operation plate to close and open the communication hole according to ambient temperature of the housing. A driven wheel fixed to the housing is located between the operation plate and the rotor. A torque transmitting section includes a first annular projection concentrically formed on the driven wheel and a plurality of second annular projections concentrically formed on the rotor. The first annular projections are overlappedly adjacent to the second annular projections so as to establish fluid coupling therebetween through the viscous fluid.Type: GrantFiled: July 26, 2002Date of Patent: January 20, 2004Assignee: Unisia Jecs CorporationInventors: Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
-
Publication number: 20020185354Abstract: A viscous fluid coupling includes a housing rotatably supported to a drive shaft of an engine. An operation plate set in the housing divides a space of the housing into a reservoir and an operation chamber. The operation plate has a communication hole communicating the reservoir and the operation chamber. A rotor fixed to the drive shaft is disposed in the operation chamber. A valve mechanism installed to the operation plate to close and open the communication hole according to ambient temperature of the housing. A driven wheel fixed to the housing is located between the operation plate and the rotor. A torque transmitting section includes a first annular projection concentrically formed on the driven wheel and a plurality of second annular projections concentrically formed on the rotor. The first annular projections are overlappedly adjacent to the second annular projections so as to establish fluid coupling therebetween through the viscous fluid.Type: ApplicationFiled: July 26, 2002Publication date: December 12, 2002Applicant: UNISIA JECS CORPORATIONInventors: Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
-
Patent number: 6474458Abstract: A viscous fluid coupling includes a housing rotatably supported to a drive shaft of an engine. An operation plate set in the housing divides a space of the housing into a reservoir and an operation chamber. The operation plate has a communication hole communicating the reservoir and the operation chamber. A rotor fixed to the drive shaft is disposed in the operation chamber. A valve mechanism installed to the operation plate to close and open the communication hole according to ambient temperature of the housing. A driven wheel fixed to the housing is located between the operation plate and the rotor. A torque transmitting section includes a first annular projection concentrically formed on the driven wheel and a plurality of second annular projections concentrically formed on the rotor. The first annular projections are overlappedly adjacent to the second annular projections so as to establish fluid coupling therebetween through the viscous fluid.Type: GrantFiled: May 25, 2001Date of Patent: November 5, 2002Assignee: Unisia Jecs CorporationInventors: Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
-
Patent number: 6336538Abstract: A fluid coupling includes an operation plate for defining storage and working chambers in a housing and having a communicating hole for fluid communication between the two, a driven wheel arranged adjacent to the operation plate, a torque-transfer part for transmitting torque of a rotor to the housing, and a valve mechanism for opening and closing the communicating hole. An auxiliary chamber, which is arranged in the driven wheel, brings working fluid out of the communicating hole to the torque-transfer part. A positioning mechanism ensures circumferential positioning of the operation plate and the driven wheel.Type: GrantFiled: June 22, 2000Date of Patent: January 8, 2002Assignee: Unisia Jecs CorporationInventors: Hirofumi Katoh, Kenji Ohhara, Yasuo Fujita
-
Patent number: 6305519Abstract: A viscous fluid coupling includes a housing rotatably supported to a drive shaft of an engine. An operation plate set in the housing divides a space of the housing into a reservoir and an operation chamber. The operation plate has a communication hole communicating the reservoir and the operation chamber. A rotor fixed to the drive shaft is disposed in the operation chamber. A valve mechanism installed to the operation plate to close and open the communication hole according to ambient temperature of the housing. A driven wheel fixed to the housing is located between the operation plate and the rotor. A torque transmitting section includes a first annular projection concentrically formed on the driven wheel and a plurality of second annular projections concentrically formed on the rotor. The first annular projections are overlappedly adjacent to the second annular projections so as to establish fluid coupling therebetween through the viscous fluid.Type: GrantFiled: April 9, 1999Date of Patent: October 23, 2001Assignee: Unisia Jecs CorporationInventors: Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
-
Publication number: 20010023808Abstract: A viscous fluid coupling includes a housing rotatably supported to a drive shaft of an engine. An operation plate set in the housing divides a space of the housing into a reservoir and an operation chamber. The operation plate has a communication hole communicating the reservoir and the operation chamber. A rotor fixed to the drive shaft is disposed in the operation chamber. A valve mechanism installed to the operation plate to close and open the communication hole according to ambient temperature of the housing. A driven wheel fixed to the housing is located between the operation plate and the rotor. A torque transmitting section includes a first annular projection concentrically formed on the driven wheel and a plurality of second annular projections concentrically formed on the rotor. The first annular projections are overlappedly adjacent to the second annular projections so as to establish fluid coupling therebetween through the viscous fluid.Type: ApplicationFiled: May 25, 2001Publication date: September 27, 2001Inventors: Hirofumi Katoh, Shinichi Kawada, Kenzi Ohhara, Yasuo Fujita
-
Patent number: 6220416Abstract: A temperature-sensing, variable-speed fan drive with a fluid coupling filled with working fluid, for cooling two stacked heat exchangers, namely an engine cooling-system radiator and an air-conditioner condenser located in front of the radiator, comprises a partition plate dividing the internal space of a fan housing into a reservoir chamber and a working chamber, and two different communication ports, each formed in the partition plate to communicate the reservoir chamber with the working chamber. In addition to a first valve mechanism which adjusts the opening of one of the two communication ports in response to atmospheric temperature in the circumference of the housing, a second valve mechanism is provided to adjust the opening of the other of the two communication ports in response to a refrigerant pressure in the air-conditioner condenser.Type: GrantFiled: October 29, 1999Date of Patent: April 24, 2001Assignee: Unisia Jecs CorporationInventors: Hirofumi Katoh, Tatsuyuki Matsuya
-
Patent number: 5803221Abstract: A viscous fluid clutch includes a housing rotatably mounted to a drive shaft and a clutch plate attached to the drive shaft. These relatively rotatable members have a fluid shear space therebetween and cooperable with a fluid medium in the shear space to provide a shear-type fluid drive therebetween. The housing includes a reservoir, an operating chamber and a pump outlet opening communicating between the operating chamber and the reservoir. An annular wall is secured at its inner and outer peripheral edges to the clutch plate and includes an annular bend between the outer and inner peripheral edges to define an annular auxiliary reservoir in cooperation with the clutch plate. The housing has an annular recess accommodating the annular bend. The annular recess is defined by a cylindrical inner surface. This cylindrical inner surface and the opposed surface of the annular bend define therebetween an annular passage communicating with the operating chamber.Type: GrantFiled: October 30, 1996Date of Patent: September 8, 1998Assignee: Unisia Jecs CorporationInventors: Shinichi Kawada, Kenji Ohhara, Hirofumi Katoh, Yasuo Fujita